I am preparing to install a getrag 6 speed and a 3.64 diff in my M Roadster.
I have done extensive research on this conversion and understand the typical driveshaft options.
I have a couple ideas and need to know the exact length of the front section of the Z3M driveshaft. I have not been successful at finding this dimension anywhere. I know the legnth of th entire driveshaft.

I am curious if anyone has a driveshaft out of a car to measure, or already happens to know the dimension.
I need the measurement from the flat surface the guibo touches all the way to the very end.